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Thanks Terry. Its going to be scary enough washing the mirror without pulling it apart to try to round up the stars. I'll check the collimation and the guiding and see how I go.
After Berts suggestion about the guiding I went back and checked M7, NGC104 and NGC2070. I did all these last night without changing the camera angle at all, and only one slight change of focus (using the "B" Mask). M7 was by far the worse, then Tuc 47, then the Tarantula. The Tarantula was fairly good, not great, but passable. So looks like it maybe some variable like guiding.
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